diff --git a/src/Exception/NodeException.php b/src/Exception/NodeException.php
new file mode 100644
index 0000000..21b6d18
--- /dev/null
+++ b/src/Exception/NodeException.php
@@ -0,0 +1,24 @@
+<?php
+
+/**
+ * This file is part of the ramsey/uuid library
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
+ * @license http://opensource.org/licenses/MIT MIT
+ */
+
+declare(strict_types=1);
+
+namespace Ramsey\Uuid\Exception;
+
+use RuntimeException as PhpRuntimeException;
+
+/**
+ * Thrown to indicate that attempting to fetch or create a node ID encountered an error
+ */
+class NodeException extends PhpRuntimeException
+{
+}
diff --git a/src/Provider/Node/FallbackNodeProvider.php b/src/Provider/Node/FallbackNodeProvider.php
index f0437aa..f6e5e40 100644
--- a/src/Provider/Node/FallbackNodeProvider.php
+++ b/src/Provider/Node/FallbackNodeProvider.php
@@ -14,7 +14,9 @@ declare(strict_types=1);
 
 namespace Ramsey\Uuid\Provider\Node;
 
+use Ramsey\Uuid\Exception\NodeException;
 use Ramsey\Uuid\Provider\NodeProviderInterface;
+use Ramsey\Uuid\Type\Hexadecimal;
 
 /**
  * FallbackNodeProvider retrieves the system node ID by stepping through a list
@@ -35,18 +37,25 @@ class FallbackNodeProvider implements NodeProviderInterface
         $this->nodeProviders = $providers;
     }
 
-    /**
-     * @inheritDoc
-     */
-    public function getNode()
+    public function getNode(): Hexadecimal
     {
+        $lastProviderException = null;
+
         /** @var NodeProviderInterface $provider */
         foreach ($this->nodeProviders as $provider) {
-            if ($node = $provider->getNode()) {
-                return $node;
+            try {
+                return $provider->getNode();
+            } catch (NodeException $exception) {
+                $lastProviderException = $exception;
+
+                continue;
             }
         }
 
-        return null;
+        throw new NodeException(
+            'Unable to find a suitable node provider',
+            0,
+            $lastProviderException
+        );
     }
 }
diff --git a/src/Provider/Node/RandomNodeProvider.php b/src/Provider/Node/RandomNodeProvider.php
index ce0d6eb..266c0b7 100644
--- a/src/Provider/Node/RandomNodeProvider.php
+++ b/src/Provider/Node/RandomNodeProvider.php
@@ -16,6 +16,7 @@ namespace Ramsey\Uuid\Provider\Node;
 
 use Ramsey\Uuid\Exception\RandomSourceException;
 use Ramsey\Uuid\Provider\NodeProviderInterface;
+use Ramsey\Uuid\Type\Hexadecimal;
 
 use function bin2hex;
 use function dechex;
@@ -33,10 +34,7 @@ use const STR_PAD_LEFT;
  */
 class RandomNodeProvider implements NodeProviderInterface
 {
-    /**
-     * @inheritDoc
-     */
-    public function getNode()
+    public function getNode(): Hexadecimal
     {
         try {
             $nodeBytes = random_bytes(6);
@@ -65,6 +63,6 @@ class RandomNodeProvider implements NodeProviderInterface
         // Recombine the node bytes.
         $node = $nodeMsb . $nodeLsb;
 
-        return str_pad(bin2hex($node), 12, '0', STR_PAD_LEFT);
+        return new Hexadecimal(str_pad(bin2hex($node), 12, '0', STR_PAD_LEFT));
     }
 }
diff --git a/src/Provider/Node/StaticNodeProvider.php b/src/Provider/Node/StaticNodeProvider.php
index b07a291..51f1b02 100644
--- a/src/Provider/Node/StaticNodeProvider.php
+++ b/src/Provider/Node/StaticNodeProvider.php
@@ -51,12 +51,9 @@ class StaticNodeProvider implements NodeProviderInterface
         $this->node = $this->setMulticastBit($node);
     }
 
-    /**
-     * @inheritDoc
-     */
-    public function getNode()
+    public function getNode(): Hexadecimal
     {
-        return $this->node->toString();
+        return $this->node;
     }
 
     /**
diff --git a/src/Provider/Node/SystemNodeProvider.php b/src/Provider/Node/SystemNodeProvider.php
index 486f194..8234aba 100644
--- a/src/Provider/Node/SystemNodeProvider.php
+++ b/src/Provider/Node/SystemNodeProvider.php
@@ -14,13 +14,14 @@ declare(strict_types=1);
 
 namespace Ramsey\Uuid\Provider\Node;
 
+use Ramsey\Uuid\Exception\NodeException;
 use Ramsey\Uuid\Provider\NodeProviderInterface;
+use Ramsey\Uuid\Type\Hexadecimal;
 
 use function array_filter;
 use function array_map;
 use function array_walk;
 use function count;
-use function is_array;
 use function ob_get_clean;
 use function ob_start;
 use function preg_match;
@@ -44,37 +45,48 @@ use const PREG_PATTERN_ORDER;
 class SystemNodeProvider implements NodeProviderInterface
 {
     /**
-     * @inheritDoc
+     * Pattern to match nodes in ifconfig and ipconfig output.
      */
-    public function getNode()
+    private const IFCONFIG_PATTERN = '/[^:]([0-9a-f]{2}([:-])[0-9a-f]{2}(\2[0-9a-f]{2}){4})[^:]/i';
+
+    /**
+     * Pattern to match nodes in sysfs stream output.
+     */
+    private const SYSFS_PATTERN = '/^([0-9a-f]{2}:){5}[0-9a-f]{2}$/i';
+
+    public function getNode(): Hexadecimal
+    {
+        $node = $this->getNodeFromSystem();
+
+        if ($node === '') {
+            throw new NodeException(
+                'Unable to fetch a node for this system'
+            );
+        }
+
+        return new Hexadecimal($node);
+    }
+
+    /**
+     * Returns the system node, if it can find it
+     */
+    protected function getNodeFromSystem(): string
     {
         static $node = null;
 
         if ($node !== null) {
-            return $node;
+            return (string) $node;
         }
 
-        $pattern = '/[^:]([0-9A-Fa-f]{2}([:-])[0-9A-Fa-f]{2}(\2[0-9A-Fa-f]{2}){4})[^:]/';
-        $matches = [];
-
         // First, try a Linux-specific approach.
         $node = $this->getSysfs();
 
-        // Search the ifconfig output for all MAC addresses and return
-        // the first one found.
-        if ($node === false) {
-            if (preg_match_all($pattern, $this->getIfconfig(), $matches, PREG_PATTERN_ORDER)) {
-                $node = $matches[1][0] ?? false;
-            }
+        if ($node === '') {
+            // Search ifconfig output for MAC addresses & return the first one.
+            $node = $this->getIfconfig();
         }
 
-        if ($node !== false) {
-            $node = str_replace([':', '-'], '', $node);
-
-            if (is_array($node)) {
-                $node = $node[0] ?? false;
-            }
-        }
+        $node = str_replace([':', '-'], '', $node);
 
         return $node;
     }
@@ -84,7 +96,7 @@ class SystemNodeProvider implements NodeProviderInterface
      *
      * @codeCoverageIgnore
      */
-    private function getIfconfig(): string
+    protected function getIfconfig(): string
     {
         $disabledFunctions = strtolower((string) ini_get('disable_functions'));
 
@@ -113,23 +125,28 @@ class SystemNodeProvider implements NodeProviderInterface
                 break;
         }
 
-        return (string) ob_get_clean();
+        $ifconfig = (string) ob_get_clean();
+
+        $node = '';
+        if (preg_match_all(self::IFCONFIG_PATTERN, $ifconfig, $matches, PREG_PATTERN_ORDER)) {
+            $node = $matches[1][0] ?? '';
+        }
+
+        return (string) $node;
     }
 
     /**
      * Returns MAC address from the first system interface via the sysfs interface
-     *
-     * @return string|bool
      */
-    protected function getSysfs()
+    protected function getSysfs(): string
     {
-        $mac = false;
+        $mac = '';
 
         if (strtoupper(constant('PHP_OS')) === 'LINUX') {
             $addressPaths = glob('/sys/class/net/*/address', GLOB_NOSORT);
 
             if ($addressPaths === false || count($addressPaths) === 0) {
-                return false;
+                return '';
             }
 
             $macs = [];
@@ -145,12 +162,12 @@ class SystemNodeProvider implements NodeProviderInterface
             // Remove invalid entries.
             $macs = array_filter($macs, function (string $address) {
                 return $address !== '00:00:00:00:00:00'
-                    && preg_match('/^([0-9a-f]{2}:){5}[0-9a-f]{2}$/i', $address);
+                    && preg_match(self::SYSFS_PATTERN, $address);
             });
 
             $mac = reset($macs);
         }
 
-        return $mac;
+        return (string) $mac;
     }
 }
diff --git a/src/Provider/NodeProviderInterface.php b/src/Provider/NodeProviderInterface.php
index 0f7c024..d536b45 100644
--- a/src/Provider/NodeProviderInterface.php
+++ b/src/Provider/NodeProviderInterface.php
@@ -14,18 +14,17 @@ declare(strict_types=1);
 
 namespace Ramsey\Uuid\Provider;
 
+use Ramsey\Uuid\Type\Hexadecimal;
+
 /**
- * A node provider retrieves the system node ID
- *
- * The system node ID, or host ID, is often the same as the MAC address for a
- * network interface on the host.
+ * A node provider retrieves or generates a node ID
  */
 interface NodeProviderInterface
 {
     /**
-     * Returns the system node ID
+     * Returns a node ID
      *
-     * @return string|false|null System node ID as a hexadecimal string
+     * @return Hexadecimal The node ID as a hexadecimal string
      */
-    public function getNode();
+    public function getNode(): Hexadecimal;
 }
diff --git a/tests/ExpectedBehaviorTest.php b/tests/ExpectedBehaviorTest.php
index cc3028f..18e20a3 100644
--- a/tests/ExpectedBehaviorTest.php
+++ b/tests/ExpectedBehaviorTest.php
@@ -526,7 +526,7 @@ class ExpectedBehaviorTest extends TestCase
     public function testUsingDefaultTimeGeneratorWithCustomProviders()
     {
         $nodeProvider = \Mockery::mock('Ramsey\Uuid\Provider\NodeProviderInterface', [
-            'getNode' => '0123456789ab',
+            'getNode' => new Hexadecimal('0123456789ab'),
         ]);
 
         $timeConverter = \Mockery::mock('Ramsey\Uuid\Converter\TimeConverterInterface');
diff --git a/tests/Generator/DceSecurityGeneratorTest.php b/tests/Generator/DceSecurityGeneratorTest.php
index 4961bd5..24aad62 100644
--- a/tests/Generator/DceSecurityGeneratorTest.php
+++ b/tests/Generator/DceSecurityGeneratorTest.php
@@ -56,7 +56,7 @@ class DceSecurityGeneratorTest extends TestCase
         ]);
 
         $nodeProvider = Mockery::mock(NodeProviderInterface::class, [
-            'getNode' => $node,
+            'getNode' => new Hexadecimal($node),
         ]);
 
         $timeProvider = new FixedTimeProvider(new Time($seconds, $microseconds));
diff --git a/tests/Generator/DefaultTimeGeneratorTest.php b/tests/Generator/DefaultTimeGeneratorTest.php
index 4715117..acf98bd 100644
--- a/tests/Generator/DefaultTimeGeneratorTest.php
+++ b/tests/Generator/DefaultTimeGeneratorTest.php
@@ -87,7 +87,7 @@ class DefaultTimeGeneratorTest extends TestCase
     {
         $this->nodeProvider->expects($this->once())
             ->method('getNode')
-            ->willReturn('122f80ca9e06');
+            ->willReturn(new Hexadecimal('122f80ca9e06'));
         $this->timeConverter->expects($this->once())
             ->method('calculateTime')
             ->with($this->currentTime['sec'], $this->currentTime['usec'])
diff --git a/tests/Provider/Node/FallbackNodeProviderTest.php b/tests/Provider/Node/FallbackNodeProviderTest.php
index 63035e5..4cc7f5f 100644
--- a/tests/Provider/Node/FallbackNodeProviderTest.php
+++ b/tests/Provider/Node/FallbackNodeProviderTest.php
@@ -4,10 +4,12 @@ declare(strict_types=1);
 
 namespace Ramsey\Uuid\Test\Provider\Node;
 
+use Ramsey\Uuid\Exception\NodeException;
 use Ramsey\Uuid\Provider\Node\FallbackNodeProvider;
 use Ramsey\Uuid\Provider\Node\NodeProviderCollection;
 use Ramsey\Uuid\Provider\NodeProviderInterface;
 use Ramsey\Uuid\Test\TestCase;
+use Ramsey\Uuid\Type\Hexadecimal;
 
 class FallbackNodeProviderTest extends TestCase
 {
@@ -16,11 +18,11 @@ class FallbackNodeProviderTest extends TestCase
         $providerWithNode = $this->getMockBuilder(NodeProviderInterface::class)->getMock();
         $providerWithNode->expects($this->once())
             ->method('getNode')
-            ->willReturn('57764a07f756');
+            ->willReturn(new Hexadecimal('57764a07f756'));
         $providerWithoutNode = $this->getMockBuilder(NodeProviderInterface::class)->getMock();
         $providerWithoutNode->expects($this->once())
             ->method('getNode')
-            ->willReturn(null);
+            ->willThrowException(new NodeException());
 
         $provider = new FallbackNodeProvider(new NodeProviderCollection([$providerWithoutNode, $providerWithNode]));
         $provider->getNode();
@@ -31,11 +33,11 @@ class FallbackNodeProviderTest extends TestCase
         $providerWithoutNode = $this->getMockBuilder(NodeProviderInterface::class)->getMock();
         $providerWithoutNode->expects($this->once())
             ->method('getNode')
-            ->willReturn(null);
+            ->willThrowException(new NodeException());
         $providerWithNode = $this->getMockBuilder(NodeProviderInterface::class)->getMock();
         $providerWithNode->expects($this->once())
             ->method('getNode')
-            ->willReturn('57764a07f756');
+            ->willReturn(new Hexadecimal('57764a07f756'));
         $anotherProviderWithoutNode = $this->getMockBuilder(NodeProviderInterface::class)->getMock();
         $anotherProviderWithoutNode->expects($this->never())
             ->method('getNode');
@@ -48,15 +50,19 @@ class FallbackNodeProviderTest extends TestCase
         $this->assertEquals('57764a07f756', $node);
     }
 
-    public function testGetNodeReturnsNullWhenNoNodesFound(): void
+    public function testGetNodeThrowsExceptionWhenNoNodesFound(): void
     {
         $providerWithoutNode = $this->getMockBuilder(NodeProviderInterface::class)->getMock();
         $providerWithoutNode->method('getNode')
-            ->willReturn(null);
+            ->willThrowException(new NodeException());
 
         $provider = new FallbackNodeProvider(new NodeProviderCollection([$providerWithoutNode]));
-        $node = $provider->getNode();
 
-        $this->assertNull($node);
+        $this->expectException(NodeException::class);
+        $this->expectExceptionMessage(
+            'Unable to find a suitable node provider'
+        );
+
+        $provider->getNode();
     }
 }
diff --git a/tests/Provider/Node/RandomNodeProviderTest.php b/tests/Provider/Node/RandomNodeProviderTest.php
index 93867cf..bf81815 100644
--- a/tests/Provider/Node/RandomNodeProviderTest.php
+++ b/tests/Provider/Node/RandomNodeProviderTest.php
@@ -37,7 +37,7 @@ class RandomNodeProviderTest extends TestCase
         $provider = new RandomNodeProvider();
         $node = $provider->getNode();
 
-        $this->assertSame($expectedNode, $node);
+        $this->assertSame($expectedNode, $node->toString());
         $randomBytes->verifyInvoked([6]);
     }
 
@@ -55,7 +55,7 @@ class RandomNodeProviderTest extends TestCase
         $randomBytes = AspectMock::func('Ramsey\Uuid\Provider\Node', 'random_bytes', $bytes);
         $provider = new RandomNodeProvider();
 
-        $this->assertSame($expectedNode, $provider->getNode());
+        $this->assertSame($expectedNode, $provider->getNode()->toString());
         $randomBytes->verifyInvoked([6]);
     }
 
@@ -74,7 +74,7 @@ class RandomNodeProviderTest extends TestCase
         $randomBytes = AspectMock::func('Ramsey\Uuid\Provider\Node', 'random_bytes', $bytes);
         $provider = new RandomNodeProvider();
 
-        $this->assertSame($expectedNode, $provider->getNode());
+        $this->assertSame($expectedNode, $provider->getNode()->toString());
         $randomBytes->verifyInvoked([6]);
     }
 
@@ -90,7 +90,7 @@ class RandomNodeProviderTest extends TestCase
         $randomBytes = AspectMock::func('Ramsey\Uuid\Provider\Node', 'random_bytes', $bytes);
         $provider = new RandomNodeProvider();
 
-        $this->assertSame($expectedNode, $provider->getNode());
+        $this->assertSame($expectedNode, $provider->getNode()->toString());
         $randomBytes->verifyInvoked([6]);
     }
 
diff --git a/tests/Provider/Node/StaticNodeProviderTest.php b/tests/Provider/Node/StaticNodeProviderTest.php
index 72d0eec..e8665ca 100644
--- a/tests/Provider/Node/StaticNodeProviderTest.php
+++ b/tests/Provider/Node/StaticNodeProviderTest.php
@@ -18,7 +18,7 @@ class StaticNodeProviderTest extends TestCase
     {
         $staticNode = new StaticNodeProvider($node);
 
-        $this->assertSame($expectedNode, $staticNode->getNode());
+        $this->assertSame($expectedNode, $staticNode->getNode()->toString());
     }
 
     /**
diff --git a/tests/Provider/Node/SystemNodeProviderTest.php b/tests/Provider/Node/SystemNodeProviderTest.php
index fd02bb1..bc27d1d 100644
--- a/tests/Provider/Node/SystemNodeProviderTest.php
+++ b/tests/Provider/Node/SystemNodeProviderTest.php
@@ -6,8 +6,8 @@ namespace Ramsey\Uuid\Test\Provider\Node;
 
 use AspectMock\Proxy\FuncProxy;
 use AspectMock\Test as AspectMock;
-use Mockery;
 use Ramsey\Uuid\Exception\InvalidArgumentException;
+use Ramsey\Uuid\Exception\NodeException;
 use Ramsey\Uuid\Provider\Node\SystemNodeProvider;
 use Ramsey\Uuid\Test\TestCase;
 
@@ -84,13 +84,13 @@ class SystemNodeProviderTest extends TestCase
         /* Assert the result match expectations */
         $this->assertMockFunctions(null, null, ['netstat -ie 2>&1'], ['PHP_OS'], ['disable_functions']);
 
-        $this->assertSame($expected, $node);
+        $this->assertSame($expected, $node->toString());
 
         $message = vsprintf(
             'Node should be a hexadecimal string of 12 characters. Actual node: %s (length: %s)',
-            [$node, strlen($node),]
+            [$node->toString(), strlen($node->toString()),]
         );
-        $this->assertRegExp('/^[A-Fa-f0-9]{12}$/', $node, $message);
+        $this->assertRegExp('/^[A-Fa-f0-9]{12}$/', $node->toString(), $message);
     }
 
     /**
@@ -112,13 +112,18 @@ class SystemNodeProviderTest extends TestCase
         );
 
         /* Act */
+        $exception = null;
         $provider = new SystemNodeProvider();
-        $node = $provider->getNode();
+
+        try {
+            $node = $provider->getNode();
+        } catch (NodeException $exception) {
+            // do nothing
+        }
 
         /* Assert */
         $this->assertMockFunctions(null, null, ['netstat -ie 2>&1'], ['PHP_OS'], ['disable_functions']);
-
-        $this->assertFalse($node);
+        $this->assertInstanceOf(NodeException::class, $exception);
     }
 
     /**
@@ -146,7 +151,7 @@ class SystemNodeProviderTest extends TestCase
         /* Assert */
         $this->assertMockFunctions(null, null, ['netstat -ie 2>&1'], ['PHP_OS'], ['disable_functions']);
 
-        $this->assertEquals($expected, $node);
+        $this->assertEquals($expected, $node->toString());
     }
 
     /**
@@ -168,13 +173,18 @@ class SystemNodeProviderTest extends TestCase
         );
 
         /* Act */
+        $exception = null;
         $provider = new SystemNodeProvider();
-        $node = $provider->getNode();
+
+        try {
+            $node = $provider->getNode();
+        } catch (NodeException $exception) {
+            // do nothing
+        }
 
         /* Assert */
         $this->assertMockFunctions(null, null, ['netstat -ie 2>&1'], ['PHP_OS'], ['disable_functions']);
-
-        $this->assertEquals(false, $node);
+        $this->assertInstanceOf(NodeException::class, $exception);
     }
 
     /**
@@ -201,7 +211,7 @@ class SystemNodeProviderTest extends TestCase
         /* Assert */
         $this->assertMockFunctions(null, null, ['netstat -ie 2>&1'], ['PHP_OS'], ['disable_functions']);
 
-        $this->assertEquals('AABBCCDDEEFF', $node);
+        $this->assertEquals('aabbccddeeff', $node->toString());
     }
 
     /**
@@ -222,13 +232,18 @@ class SystemNodeProviderTest extends TestCase
         );
 
         /* Act */
+        $exception = null;
         $provider = new SystemNodeProvider();
-        $node = $provider->getNode();
+
+        try {
+            $node = $provider->getNode();
+        } catch (NodeException $exception) {
+            // do nothing
+        }
 
         /* Assert */
         $this->assertMockFunctions(null, null, ['netstat -ie 2>&1'], ['PHP_OS'], ['disable_functions']);
-
-        $this->assertFalse($node);
+        $this->assertInstanceOf(NodeException::class, $exception);
     }
 
     /**
@@ -249,14 +264,26 @@ class SystemNodeProviderTest extends TestCase
         );
 
         /* Act */
+        $exception1 = null;
+        $exception2 = null;
         $provider = new SystemNodeProvider();
-        $provider->getNode();
-        $node = $provider->getNode();
+
+        try {
+            $provider->getNode();
+        } catch (NodeException $exception1) {
+            // do nothing
+        }
+
+        try {
+            $provider->getNode();
+        } catch (NodeException $exception2) {
+            // do nothing
+        }
 
         /* Assert */
         $this->assertMockFunctions(null, null, ['netstat -ie 2>&1'], ['PHP_OS'], ['disable_functions']);
-
-        $this->assertFalse($node);
+        $this->assertInstanceOf(NodeException::class, $exception1);
+        $this->assertInstanceOf(NodeException::class, $exception2);
     }
 
     /**
@@ -277,8 +304,14 @@ class SystemNodeProviderTest extends TestCase
         );
 
         /* Act */
+        $exception = null;
         $provider = new SystemNodeProvider();
-        $node = $provider->getNode();
+
+        try {
+            $node = $provider->getNode();
+        } catch (NodeException $exception) {
+            // do nothing
+        }
 
         /* Assert */
         $globBodyAssert = null;
@@ -298,7 +331,7 @@ class SystemNodeProviderTest extends TestCase
             $isReadableAssert
         );
 
-        $this->assertFalse($node);
+        $this->assertInstanceOf(NodeException::class, $exception);
     }
 
     /**
@@ -326,7 +359,7 @@ class SystemNodeProviderTest extends TestCase
         /* Assert */
         $this->assertMockFunctions(null, null, ['netstat -ie 2>&1'], ['PHP_OS'], ['disable_functions']);
 
-        $this->assertEquals($node, $node2);
+        $this->assertEquals($node->toString(), $node2->toString());
     }
 
     /**
@@ -354,7 +387,7 @@ class SystemNodeProviderTest extends TestCase
         /* Assert */
         $this->assertMockFunctions(null, null, ['netstat -ie 2>&1'], ['PHP_OS'], ['disable_functions']);
 
-        $this->assertEquals($node, $node2);
+        $this->assertEquals($node->toString(), $node2->toString());
     }
 
     /**
@@ -409,7 +442,7 @@ class SystemNodeProviderTest extends TestCase
             $isReadableAssert
         );
 
-        $this->assertEquals('010203040506', $node);
+        $this->assertEquals('010203040506', $node->toString());
     }
 
     /**
@@ -442,7 +475,7 @@ class SystemNodeProviderTest extends TestCase
             ['disable_functions']
         );
 
-        $this->assertEquals('010203040506', $node);
+        $this->assertEquals('010203040506', $node->toString());
     }
 
     /**
@@ -475,7 +508,7 @@ class SystemNodeProviderTest extends TestCase
             ['disable_functions']
         );
 
-        $this->assertEquals('010203040506', $node);
+        $this->assertEquals('010203040506', $node->toString());
     }
 
     /**
@@ -510,7 +543,7 @@ class SystemNodeProviderTest extends TestCase
             ['mock address path 1', 'mock address path 2']
         );
 
-        $this->assertEquals('010203040506', $node);
+        $this->assertEquals('010203040506', $node->toString());
     }
 
     /**
@@ -529,8 +562,14 @@ class SystemNodeProviderTest extends TestCase
         );
 
         /* Act */
+        $exception = null;
         $provider = new SystemNodeProvider();
-        $node = $provider->getNode();
+
+        try {
+            $node = $provider->getNode();
+        } catch (NodeException $exception) {
+            // do nothing
+        }
 
         /* Assert */
         $this->assertMockFunctions(
@@ -541,7 +580,7 @@ class SystemNodeProviderTest extends TestCase
             ['disable_functions']
         );
 
-        $this->assertFalse($node);
+        $this->assertInstanceOf(NodeException::class, $exception);
     }
 
     /**
@@ -845,7 +884,7 @@ TXT
                    DHCP Enabled. . . . . . . . . . . : No
                    Autoconfiguration Enabled . . . . : Yes
 TXT
-                , '080027B842C6',
+                , '080027b842c6',
             ],
             'Full output - FreeBSD' => [<<<'TXT'
                 Name    Mtu Network       Address              Ipkts Ierrs Idrop    Opkts Oerrs  Coll
@@ -859,51 +898,23 @@ TXT
             /* The single line that is relevant */
             'Linux  - single line'  => ["\ndocker0   Link encap:Ethernet  HWaddr 01:23:45:67:89:ab\n", '0123456789ab'],
             'MacOS  - Single line ' => ["\nether 10:dd:b1:b4:e4:8e\n", '10ddb1b4e48e'],
-            'Window - single line' => ["\nPhysical Address. . . . . . . . . : 08-00-27-B8-42-C6\n", '080027B842C6'],
+            'Window - single line' => ["\nPhysical Address. . . . . . . . . : 08-00-27-B8-42-C6\n", '080027b842c6'],
 
             /* Minimal subsets of the single line to show the differences */
-            'with colon, with linebreak, with space'          => ["\n : AA-BB-CC-DD-EE-FF\n", 'AABBCCDDEEFF'],
-            'without colon, with linebreak, with space'       => ["\n AA-BB-CC-DD-EE-FF \n",  'AABBCCDDEEFF'],
-            'without colon, with linebreak, without space'    => ["\nAA-BB-CC-DD-EE-FF\n",    'AABBCCDDEEFF'],
-            'without colon, without linebreak, with space'    => [' AA-BB-CC-DD-EE-FF ',      'AABBCCDDEEFF'],
+            'with colon, with linebreak, with space'          => ["\n : AA-BB-CC-DD-EE-FF\n", 'aabbccddeeff'],
+            'without colon, with linebreak, with space'       => ["\n AA-BB-CC-DD-EE-FF \n",  'aabbccddeeff'],
+            'without colon, with linebreak, without space'    => ["\nAA-BB-CC-DD-EE-FF\n",    'aabbccddeeff'],
+            'without colon, without linebreak, with space'    => [' AA-BB-CC-DD-EE-FF ',      'aabbccddeeff'],
 
             /* Other accepted variations */
             'Actual mac - 1'               => ["\n52:54:00:14:91:69\n",    '525400149169'],
             'Actual mac - 2'               => ["\n00:16:3e:a9:73:f0\n",    '00163ea973f0'],
-            'FF:FF:FF:FF:FF:FF'            => ["\nFF:FF:FF:FF:FF:FF\n",    'FFFFFFFFFFFF'],
+            'FF:FF:FF:FF:FF:FF'            => ["\nFF:FF:FF:FF:FF:FF\n",    'ffffffffffff'],
 
             /* Incorrect variations that are also accepted */
             'Local host'                   => ["\n00:00:00:00:00:00\n",    '000000000000'],
-            'Too long -- extra character'  => ["\nABC-01-23-45-67-89\n",   'BC0123456789'],
-            'Too long -- extra tuple'      => ["\n01-AA-BB-CC-DD-EE-FF\n", '01AABBCCDDEE'],
+            'Too long -- extra character'  => ["\nABC-01-23-45-67-89\n",   'bc0123456789'],
+            'Too long -- extra tuple'      => ["\n01-AA-BB-CC-DD-EE-FF\n", '01aabbccddee'],
         ];
     }
-
-    /**
-     * @runInSeparateProcess
-     * @preserveGlobalState disabled
-     */
-    public function testInternalNodeValueIsArray(): void
-    {
-        $provider = Mockery::mock(SystemNodeProvider::class);
-        $provider->shouldAllowMockingProtectedMethods();
-        $provider->shouldReceive('getSysfs')->andReturn(['foo:bar']);
-        $provider->shouldReceive('getNode')->passthru();
-
-        $this->assertSame('foobar', $provider->getNode());
-    }
-
-    /**
-     * @runInSeparateProcess
-     * @preserveGlobalState disabled
-     */
-    public function testInternalNodeValueIsArrayWithNoElements(): void
-    {
-        $provider = Mockery::mock(SystemNodeProvider::class);
-        $provider->shouldAllowMockingProtectedMethods();
-        $provider->shouldReceive('getSysfs')->andReturn([]);
-        $provider->shouldReceive('getNode')->passthru();
-
-        $this->assertFalse($provider->getNode());
-    }
 }